Peak Luminance Control for Display Brightness Inversion
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Solution Overview
Problem
Electronic devices with adjustable display brightness and peak luminance control algorithms face challenges in maintaining adequate luminance in dim lighting conditions, leading to situations where content becomes difficult or impossible to view due to excessive dimming.
Innovation Solution
The implementation of a gamma reference block, average pixel luminance calculator, and brightness control block that perform interpolation between peak luminance control profiles to generate an interpolated lookup table for voltage settings, allowing for dynamic adjustment of display brightness based on both average pixel luminance and user-set brightness settings, thereby preventing luminance inversions and maintaining visible content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If peak luminance control algorithm reduces luminance when average luminance is high, then power consumption is limited and display longevity is extended, but in dim lighting conditions the luminance is reduced so much that content becomes difficult or impossible to view
Solution Approach 1:
The patent implements dynamic peak luminance control profiles that adapt to ambient lighting conditions. The system transitions from static luminance reduction to dynamic adjustment based on environmental context, allowing the display to maintain higher luminance in dim environments while still applying control in bright conditions. This resolves the contradiction by making the control algorithm adaptive rather than fixed.
Solution Approach 2:
The patent changes the parameters of peak luminance control by introducing ambient light sensing and contextual awareness. Instead of using a fixed threshold for luminance reduction, the system modifies control parameters based on ambient lighting levels, allowing the same display to exhibit different luminance behavior in different environmental conditions. This enables the display to avoid excessive dimming in dark environments while maintaining power control in bright settings.
2Use of energy by stationary object
If display brightness setting is lowered for dim lighting conditions, then power consumption is reduced, but when peak luminance control further reduces luminance, the display becomes too dim to view content
Solution Approach 1:
The patent introduces feedback mechanisms that monitor both the display brightness setting and ambient lighting conditions. The system uses this feedback to determine when to apply peak luminance control and when to exempt the display from further dimming. This feedback loop ensures that the display maintains adequate visibility while still achieving power savings, resolving the contradiction between energy efficiency and content visibility.
Solution Approach 2:
The patent implements preliminary assessment of ambient lighting conditions before applying peak luminance control. By evaluating the environment first, the system can prevent excessive dimming from occurring in the first place, rather than having to compensate afterward. This preliminary action ensures that power consumption is managed while content visibility is preserved from the outset.
3Use of energy by stationary object
If peak luminance control is applied to limit power consumption, then current draw is capped, but the display may exhibit luminance inversions where adjusting brightness setting does not produce expected luminance changes
Solution Approach 1:
The patent implements dynamic peak luminance control profiles that adapt to ambient lighting conditions. The system transitions from static luminance reduction to dynamic adjustment based on environmental context, allowing the display to maintain higher luminance in dim environments while still applying control in bright conditions. This resolves the contradiction by making the control algorithm adaptive rather than fixed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures that the display maintains relatively constant luminance across a wide range of brightness settings, preventing luminance inversions and ensuring content remains visible while minimizing power consumption and extending display longevity.
Implementation Method 1
The array of display pixels may contain rows and columns of organic light-emitting diode display pixels that display images for a user
Data Source
AI summary
A display may have an array of display pixels. Digital display data may be received by a digital-to-analog converter that converts the digital display data to analog display data. The magnitudes of the analog display data signals can be controlled by a regulated voltage received by the digital-to-analog converter. A brightness controller may have multiple peak luminance control (PLC) profiles. In accordance with an embodiment, a brightness setting may be processed by a lookup table to identify a pair of PLC profiles that is interpolated in order to obtain the desired regulated voltage. In accordance with another embodiment, a single PLC profile may be used that is a function of a combined parameter that takes into account both average frame luminance and the brightness setting. In accordance with yet another embodiment, a lookup table that specifies brightness setting offset values may be used to directly modulate the brightness setting.